基于故障旁路特征的电网电弧接地故障辨识  

Arc grounding fault identification based on sound line features in power grid

作　　者：刘鹏辉 张亚柠 戴瑜兴 宋运忠[1] Liu Penghui;Zhang Yaning;Dai Yuxing;Song Yunzhong(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454003,China;Guangdong Zhicheng Champion Group Co.,Ltd.,Dongguan 523711,China;National-Local Joint Engineering Laboratory of Electrical Digital Design Technology,Wenzhou University,Wenzhou 325035,China)

机构地区：[1]河南理工大学电气工程与自动化学院,焦作454003 [2]广东志成冠军集团有限公司,东莞523711 [3]温州大学电气数字化设计技术国家地方联合工程实验室,温州325035

出　　处：《国外电子测量技术》2024年第7期148-157,共10页Foreign Electronic Measurement Technology

基　　金：广东省“珠江人才计划”引进创新创业团队资助项目(2017ZT07G237);河南省高校基本科研业务费专项(NSFRF220425);河南省自然科学基金(232300420301)项目资助。

摘　　要：中性点有效接地供配电系统中电弧接地故障频发,而已有的故障检测方法在电弧耗散功率较小,零休时长较短时存在不足,导致检测准确性偏低。针对此问题,采用故障旁路零序电流特征进行故障辨识。首先,探究了电弧接地故障下故障旁路零序电流的形成机理,揭示了电弧故障特征向故障旁路信号的传递作用。然后,采用梯度积及相关系数指标,描述故障旁路零序电流信号特征,建立辨识判据,实现故障类型判别。最后,仿真结果及实验结果验证了所提方法的有效性。对比分析表明,其相比于已有方法,该方法具有较高的识别精度。特别是在电弧耗散功率小于2×103 W、零休特征不明显的故障场景中,该方法更具识别优势。所提方法拓展了电弧故障辨识手段,可用于预防电弧故障引发的电气火灾。Arc grounding faults occur frequently in power supply and distribution system with effective grounding neutral point.Existing fault detection methods are insufficient when arc dissipation power is small and zero rest time is short,resulting in low detection accuracy.In order to solve this problem,the zero sequence current of the fault bypass is used to identify the fault.Firstly,for the arc grounding fault,the formation mechanism of zero sequence current of fault bypass is explored,and the transmission effect of arc fault characteristics to fault bypass signal is revealed.Then,the gradient product and correlation coefficient index are used to describe the zero sequence current signal characteristics of the fault bypass,and the identification criteria is established.Finally,Simulation results and experimental data verify the effectiveness of the proposed method.Comparative analysis shows that the proposed method has higher recognition accuracy than the existing methods.Especially in the fault scenario where the arc dissipation power is less than 2×103 W and the zero-off feature is not obvious,this method has more advantages in recognition.The proposed method expands the arc fault identification method,and can be used to prevent electrical fires caused by arc faults.

关 键 词：电弧故障 梯度 相关系数 故障辨识 电气火灾 

分 类 号：TM727[电气工程—电力系统及自动化]